Woven belt.



PATENTED 001'. so, 1906. G.P.IANDRETH,

WOVEN BELT. APPLICATION FILED AUG. 26.1904.

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WOVEN BELT.

APPLICATION FILED AUG.28.1904.

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', UNITED STATES PATENT OFFICE.

Specification of Letters Patent.

Patented Oct. 30, 1906.

Application filed august 26, 1904. Serial No. 222,227.

To all whom it. may concern: Be it known that I, CLARENCE P. LAND- RETH, a citizen of the United States, residing at Boston, county of Suffolk, and State of Massachusetts, have invented an Im rovedescription, in connection with the accompanying drawings, is a specification, like characters on the drawings representing like parts.

This invention relates to belting, and especially to those classes of belting commonly known to the trade as canvas and woven belting; and it has for its object to provide a novel belt which will be more ef fective and more durable than such belts as now commonly manufactured. These canvas and woven belts are commonly made of several plies or thicknesses of material which are secured together either by stitches which extend through all the plies or by means of a all the plies.

In both of the above-described forms of 2 5 belt the binding means is common to all the plies, and therefore they are. all bound together by the same binding means. One obvious result of this construction is that after the outer ply of the belt becomes worn suffi- 0 ciently'so that the binding-threads are broken the belt as a whole goes to, pieces, because after said binding-threads, whether they are in the form of stitches or are put in in the process 'of weaving, have been broken there gether.

In my improved belting I have overcome this difiiculty by binding each ply independ- 4o ably being done during the process of weaving, so that the binding-threads are part of the threads of the ply itself.

Where each plyis independently bound to some other ply, the wearing away of the out- 5 side ply effects only the bindin means for binding said outside ply to anot er ply and does not effect the binding means between the other plies, and therefore after an outside ply has been entirely worn away the remainmg plies of the belt are bound together just as firmly as when the belt was new.

Another feature of my invention resides in making a belt of several plies so that the outer ply or plies are more loosely woven than the intermediate plies. A belt having outer plies under an undue tension. ment in Woven Belts, of which the fol owing ,on, for instance, the line a: no.

this construction has a much longer life than where all the plies have the same tension, be cause in the former case the bending of'a thick belt around a pulley does not put the Referring to the drawings, Figure 1 is a top plan view of a belt embodying my invention. Fig. 2 is a section longitudinally of the belt Fig. 3 is a similar section in a different planefor instance, on the line y y. Fig. 4 is a section on a still different planefor instance, on the line 2 2. Fig. 5 is a section on the line a a. Fig. 6 is a section on the line b b. Fig. 7 is a section on the line 00. Fig. 8 shows a modi- 7o fied form of the invention, and Fig. 9 shows a portion of a pulley with my improved belt applied thereto.

The belt illustrated in the drawings is a six-pl belt, each ply constituting practically 7;

an in ependent layer of fabric. binding thread or threads which pass through 1 For purposes of identification I have designated said plies a, b, c, d, e, and f, respectively. Each ply is formed of the usual warp- ;threads 3 and weft-threads 4, which are interwoven to form a layer of fabric. As 1 stated above, one feature of my invention relates to the manner in which the several plies g are bound or secured together, this being 1 done in such a way that each ply is independ- 8 5 en tlybound to some other ply or plies. In

,the preferred embodimentof my invention this binding is accomplished by some of the threads which form the ply so bound, and in 5 is 'nothingto hold the remaining plies to- Figs. 3 to 7 I have illustrated the binding as being accomplished by the warp-threads of the various plies, and in Fig. 8 by the weftj threads.

ently to some other ply or plies, this prefer- Fig. 2, which is a section on the line a: w,

shows the separate independent plies of fab- 5 ric one on the other. the various plies together is accomplishe the warp-threads, I prefer to use certain only Where the bindin of d by of the warp-threads of each ply as bindingthreads. In the form of the invention herein 1 ooillustrated each ply is bound to the adjacent ply, and the binding of plies a and I) together is accomplished by passing certain of the warp-threads in the upper ply at below the Weft-threads in the ply b, as shown in Fig. 3. 1o 5 Tl1e binding of the plies b and 0 together is similarly accomplished by using certain of the warp-threads in the ply b as bindingthreads and passing them beneath the weftthreads, of the ply c, as shown inFig. 4'. no

Similarly, the binding ofthe plies c and d to gether is accomplished by taking certain of The binding-threads of the various plies may have any osition relative to each other-that is, t e binding-threads of the plies may all be in the same vertical plane or;

each inadifferent vertical plane, as shown,

or the binding-threads for binding the plies a and b orany other two plies may be in the same vertical plane as those for binding any other two lies together. For the sake of clearness of illustration I have shown the bindingethreads in the various plies as situated indifferent vertical planes; but my invention is not limited to any particular location for these binding-threads.

Another form of my invention is shown in Fig. 8, wherein the binding together of the various plies is done by the Weft-threads in-.

stead of the warps, and in this embodiment it'will be observed that each ply is independently bound to some other ply or plies. The main advantage of this feature of my invention is that the wearing away of the outer ply ofthe belt will not disturb the binding means for the other-plies, as the plies b and 0 will be just-as securely bound together when the ply a is completely worn as they are when the belt was first manufactured.

Another feature of my invention relates to the manner of weaving the various plies to permit a thick belt to be bent back and forth around pulleys without injuring said belt.

Referring to Fig. 9, which shows a portion of the six-ply belt passing over a pulley, it will be seen that the outer ply lies in a circle of larger radius than the other plies, and therefore if all the plies are of the same tension when the belt is straight said outer ply will be subjected to a greater tension when passing over'the pulley. The result is that the outer ply of any portion of the belt becomes elongated or stretched when passing around a pulley. WVhen said portion of the belt leaves the pulley in. this condition and begins to travel the straight run to the neXt pulley, the stretched or elongated outer ply becomes slack and all the strain on the belt is taken by the unstretched inner ply or plies. Such inner ply or'plies gradually stretch under the strain until they are under substantially. the same tension as the other plies, and as a result the wholebelt becomes stretched slightly. The nexttime this same portion of the belt passes over the pulley the same operation is repeated, the outer ly or plies being still further stretched while passing over the pulleys and the inner ply or plies being subsequently stretched when the portion of the belt leaves the pulley. This alternate stretching of the outer ply or plies and the inner ply or plies continues so long as the belt is used until the limit of elasticity in the material is reached, after which time the plies begin to rupture and the belt becomes unfit for use. I propose to obviate this alternate stretching of the inner and outer plies by-so constructing my belt that the outer ply or plies on one orbothsurfaces of the belt are normally under less tension than the intermediate plies and can therefore readily yield lengthwise without becomingunduly stretched as the belt ispassing over a pulley.

The differences in tension between the outer ply and the intermediate ply may be secured by weaving the outer plies more loosely than said intermediate plies or by placing less tension on the warp-threads in. said outer plies while they are being woven. I may make one or more of the outer plies on either or both faces of the belt of less tension than the intermediate plies as deemed most effective and according to the number of plies in the belt.

While I prefer'to bind the various plies together by threads forming part of the fabric of each ply, yet since I believe I am the firstto provide a belt having a plurality of plies with independent binding-threads for each ply I desire to claim this broadly, regardless of the particulariway in which the bin ding is accomplished.

Inthe drawings each ply is illustrated as being bound to its adjacent ply, but it would still be within my invention to bind each ply. to some other ply than the adjacent ply, pro

vided each ply was independently bound to. some other ply.

In order to describe my invention, Ihave illustrated some forms thereof; but I do not wish to be limited to these forms, as the invention is capable of. many. variations and modifications not herein illustrated.

Having fully described my invention what I claim as new, and desire to secure byLetrters Patent, is

1., A drivingbelt, composed of a plurality of'independent closely-wovenplies, each ply being bound by a portion only. of its own threads to threads which form some other ply.

2. A belt composed of a plurality ofindependent closely-woven plies,- aportion only of the warp-threads-of each iply constituting binder-warps and beingcarried around weft:- threads ofsome otheraply.

3. Abelt composedrof a=pluralityof independent. closely-woven plies a: portiononly of the warp-threads ofieach .ply constituting binder-warps and being carried t around i the Weft-threads of some other ply, said binder- In testimony whereof I have signed my warps being in diflerent vertical lanes. name to this specification in the presence of 4. A belt 0on1 osed of a plurallty of Woven two subscribin Witnesses. I

plies, some of W 'ch are more loosely Woven CL RENCE P. LANDRETH. 5 than others, and each ply'being bound by a Witnesses:

portion only of its own threads to threads LOUIS 0. SMITH,

which form some other ply. I MARGARET A. DUNN. 

